Food Packaging Bag Reinforcing Strip for Controlled Tearing
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Solution Overview
Problem
Packaging bags for foodstuffs often fail to tear open consistently along the weakening line, leading to uncontrolled opening and potential food spillage, especially when handled carelessly.
Innovation Solution
A reinforcing strip is integrated into the overlapping area of the packaging bag, specifically in the lid flap area, to ensure controlled tearing along the weakening line, with additional reinforcement strips optionally placed parallel to the weakening line for enhanced material strength and controlled separation of the bag parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a weakening line is provided in the overlapping area to enable easy opening, then the bag can be torn open with less force, but the tearing becomes uncontrolled and may cause food spillage
Solution Approach 1:
The patent applies local quality by providing a reinforcing strip only in specific critical areas (overlapping region and lid flap area) rather than throughout the entire bag. This localized reinforcement creates different mechanical properties in different regions: the reinforced areas resist uncontrolled tearing while the weakening line area maintains easy tearability, thus resolving the contradiction between ease of opening and controlled tearing.
Solution Approach 2:
The reinforcing strip is pre-installed in the overlapping area and lid flap area before the bag is used. This preliminary reinforcement ensures that when the user pulls the lid flap, the force is directed along the intended weakening line rather than causing uncontrolled tearing at the overlapping seams, thereby enabling controlled tearing from the start of the opening process.
2Strength
If the overlapping area is made stronger to prevent uncontrolled tearing, then the bag structure becomes more stable, but the tearing process cannot be initiated easily
Solution Approach 1:
The patent creates local quality differentiation by reinforcing only the overlapping area and lid flap region with a reinforcing strip, while leaving the weakening line area unreinforced. This allows the reinforced areas to provide high tear resistance and structural stability, while the unreinforced weakening line area remains easy to tear, thus resolving the contradiction between strength and ease of tearing.
Solution Approach 2:
The reinforcing strip acts as an intermediary element that mediates between the conflicting requirements of strength and ease of tearing. By strategically placing the reinforcement in specific areas, it directs the tearing force along the intended weakening line while preventing uncontrolled tearing in critical structural areas, thus enabling both strong structure and easy opening.
3Strength
If reinforcement strips are added to control tearing, then the bag structure is strengthened, but the device complexity increases
Solution Approach 1:
The patent minimizes device complexity by applying reinforcement locally only where structurally critical (overlapping area and lid flap area) rather than throughout the entire bag. This selective reinforcement provides the necessary structural strength while adding minimal complexity to the overall bag structure.
Solution Approach 2:
The reinforcing strip creates a composite structure by combining the base bag material with an additional reinforcing layer in critical areas. This composite construction provides enhanced strength and controlled tearing properties without requiring a complete redesign of the entire bag structure, thus balancing structural strength with simplicity.
Data Source
Figure 1A~1B
AI summary
The invention relates to a packaging bag for food/foodstuffs, comprising at least a front part (1) and a back part (2), which are connected to each other at their two lateral edge regions by at least one side fold (3) or at least one side crease, and between which a bag pocket is formed with an upper open end and a lower closed end, in particular which is formed in that the front part (1) is folded backwards onto the back part (2) at a lower fold or crease, wherein the entire packaging bag has a left (1a, 2a) and a right bag part (1b, 2b), which are both connected to each other along an overlap area (4) extending between the lower and upper ends, wherein at least one weakening line (5) is provided in the overlap area (4) or laterally adjacent to it, at which the two bag parts (1a, 2a, 1b,2b) are separable from one another and the upper edge (2c) of the back part (2) projects beyond the upper edge (1c) of the advantage (1) and forms a lid flap (7) that folds onto the front part (1), wherein in the overlap area (4) of the back part (2) at least in the area forming the lid flap (7) between the two bag parts (2a, 2b) a reinforcing strip (4a) is arranged.